Form for making seamless rubber articles.



PATENTED JUNE 6. 1905.

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T. M. GREGORY. FORM FOR MAKING SEAMLESS RUBBER ARTICLES. APPLICATIONFILED SEPT. 6, 1994.

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4o 1 by reason of a method of manufacture which UNITED STATES I PatentedJune 6, 1905.

PATENT OFFICE.

. TIIo'M s M. GREGORY, oF AKRON, OHIO, ASSIGNOR TO THE MILLER RUBBERMANUFACTURING co, oF AKRON, OHIO, A CORPORATION.

FORM FOR MAK NG SEAMLESS RUBBERARTICLES. I

SPECIFICATION forming part of Letters Patent N0. 791,774 dated'J'une 6,1905.

I Application filed September 6, 1904. $erial No. 223,419.

To wZZ whom, it may concern.-

Be it known that L'THOMAS M. GREGORY, a citizen of the United States,residing at Akron, in the county of Summit and State of Ohio, haveinvented certain new and useful Improvements in Forms for MakingSeamless Rubber Articles; and I do declare that the following is afull,clear, and exact de-' ever before succeeded in making hollowflexilole rubber articles of this kind without one or more seams andribs where the edges of the parts constituting the article were joinedtogether to complete the manufacture, and the water-bags andsyringe-bags on the market and in common use are made with a continuousseam extending entirely around the same at their edges, as is wellknown. These seams are liable sooner or later to disclose weak placeshere or there and to become leaky, especially if a poor quality ofcement be employed to close the seam or if the bag be filled withexcessively hot water and subjected to heavy pressure in use, as occurswhen a person rests heavily against the same. For these and otherreasons found inthe use of these'bags, as well as for expensiveness intheir manufacture, it is desirable to have a seamless bag. which has noweak places, because of defective methods of manufacture,

but rather is equally strong at all points andis uniformly smooth overits entire surface avoids all seams and ribs.

To these ends I have conceived the inven-.

tion herein, which employs a form over or upon which the article is madeor developed by dipping the form in a suitable rubber-cement, the sameconsisting of rubber dissolved in naphtha and such other ingredients asmay be advantageously employed therewith in the 5 manufacture andgenerally comprising more or less sulfur and the like. The said form maybemade of any material or quality which can readily be given thedesiredshape "and which when used in the production of a bag, bottle, orother hollow article can be dissolved, disintegrated, or otherwisereduced orbroken up, and thus removed throughthe neck or mouth of thearticle. Of course it follows that such a form cannot be used overagain, and that only a single use is possible; but the invention doesnot requireeither expensive material or expensive labor in the.

manufacture of the forms, and paper-pulp or a suitable grade of paperstretched upon an edging or light frame will serve my purpose. As tothis particular step in the manufacture, there is a wide latitude forchoice of materials, and I do not limit myself to any special materialor manner of getting the same out of the bottle or bag, provided it beadapted to develop the article of manufacture upon its surface bydipping or immersing in the material and to be dissolved, disintegrated,or otherwise integrally softened or destroyed for removal. Having, then,a suitable form to proceed with and the material or cement in suitablestate of preparation, the manufacture is carried out by dipping the formin the cement as often as may be required to produce the article, andthe number of clippings will depend on the consistency of the cement andthe thickness or weight to be given the article. ()rdinarily from six toten immersions will suffice, but there may be more or fewer, as shall befound necessary. After the article has been thus formed it is vulcanizedor cured, and this is the end of the process of manufacture so far asthe body-of the article is concerned, assuming, of course, that thecontained form has been removed after the manner of my invention. 4

Having reference now to the accompanying drawings, forming a part ofthis specification, Figure 1 is an elevation of a Water bottle or bagmanufactured according to my invention and having the form therein, andFig. 2 is'a cross-section of bag and form.

The form thus shown consists of a borderframe a, preferably of laminatedpaper glued together, and thus made temporarily rigid,

and sides 6, formed of sheets of suitable pa per stretched upon frame aand shellacked or otherwise treated on their outer surfaces to get asmooth finish which the cement will not penetrate and upon which it willadhere and make an even unbroken deposit. This deposit or coatingdeepens with each immersion until at last the proper thickness isobtained.

What I claim is 1. A form for manufacturing rubber bags and other hollowarticles by a process of dipping in a suitable rubber-cement, the saidform having a stiff frame about its edge and flexible sides,substantially as described.

2. In the manufacture of rubber goods, such as water-bottles and kindredhollow articles, a form adapted to be dipped into liquid cement andreceive deposits .of the same there'- on, the said form consisting of arigid frame and flexible separate sides formed with an open neck,substantially as described.

3. A form for making rubber bags and other like hollow articles having asubstantially rigid frame and flexible sides stretched upon said frameand spaced apart thereon, and said sides terminating at their top in asingle opening, substantially as described.

4. A form for dipping rubber articles, the same consisting of asubstantially rigid frame and sides of sheets of paper stretched uponsaid frame and having their outer surface treated to prevent the rubberfrom adhering thereto, substantially as described.

5. A form for making rubber bags and the like having a frame and sidesof material adapted to be disintegrated byinoisture, said sidesstretched upon said frame and spaced apart inside, substantially asdescribed.

In testimony whereof I sign this specification in the presence of twowitnesses.

THOMAS M. GREGORY.

Witnesses:

WM. F. PFEIFFER, SADIE WADSWORTH.

